---
id: "CVE-2026-13764"
page: "https://infrastack.ai/live/CVE-2026-13764"
kind: "vulnerability"
aliases: ["CVE-2026-13764"]
title: "WordPress Masterstudy theme: subscribers can escalate to administrator"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["masterstudy-theme", "package", "self-hosted", "wordpress"]
not_affected_if: ["no-public-registration", "theme-not-installed"]
published_at: "2026-11-12T12:18:23+00:00"
first_seen_at: "2026-11-12T12:38:18+00:00"
updated_at: "2026-11-12T12:40:33+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-13764", "first_seen_at": "2026-11-12T12:38:18+00:00"}]
exploit_sources: []
---

# WordPress Masterstudy theme: subscribers can escalate to administrator

Link for people: https://infrastack.ai/live/CVE-2026-13764 (this .md is for agents)

The Masterstudy Education WordPress theme, through version 4.8.151, lacks authorization and nonce checks on an AJAX action. A logged-in subscriber can set a developer access token and use an auto-login flow to obtain an administrator session.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Masterstudy theme version in Appearance > Themes or the style.css header.
- Look for the `masterstudy_ms_stm_set_discard_transient` action in the theme's PHP files.

## Fix

- Update the Masterstudy theme to a version newer than `4.8.151`; the fixed version is unknown from the sources.

## Timeline

- 2026-11-12T12:38:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-13764

## From the sources

The Masterstudy - Education WordPress Theme theme for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.8.151. This is due to missing authorization and nonce validation on the `masterstudy_ms_stm_set_discard_transient` AJAX action. This makes it possible for authenticated attackers, with Subscriber-level access and above, to elevate their privileges to Administrator by setting the `stm_developer_access_token` transient and using the developer access auto-login flow to obtain administrator session cookies.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_